- public toilets- changing room facilities at gyms and schools- some competitive sports- routine cancer tests for cervical and prostate cancer- HPV injections- retirement age - number of times you can donate blood per year

Fashion departments within a store.Practicality of clothing: men's suits have deep pockets, secure inside pockets for wallets etc. Their business shoes are flat and comfortable. Women's business suits are skimpy, restrictive, have nowhere to keep valuables and the shoes at best are thin soled slip on flats, but more usually pinching high heels.Some single sex schools

- some jobs which are exempt from the sex discrimination act, such as teaching in same sex schools, jobs in welfare services eg women’s refuges, and in film or theatre where the role can only be played by a man or woman

Freemasons.A tiny handful of gentlemen's clubs in the West End of London.Mammogram clinic (I've never seen a male member of staff in one)Refuge for women escaping domestic violence (for now).

Until very recently, I'd have said:Changing rooms in the lingerie department of big storesChanging rooms marked as women'sRape advisory service, women only sessionWomen's ward in a psychiatric unitSwim sessions marked as women only

And so forth...

But increasingly it seems that a few transgender activists are testing the boundaries on all of the above.